Issue
I tested a custom card sprite that is bigger than the original, and it seems to clip in the ground in NostalRO.
Note: I modified the nostalro-client slightly to disable floor item shadows beforehand to sort of rule-out the shadow interfering with the sprite. Also I may have used a differently colored sprite for each screenshot!
Enlarged card sprites can be obtained from here
Screenshots (Official / NostalRo)

Issue
I tested a custom card sprite that is bigger than the original, and it seems to clip in the ground in NostalRO.
Note: I modified the nostalro-client slightly to disable floor item shadows beforehand to sort of rule-out the shadow interfering with the sprite. Also I may have used a differently colored sprite for each screenshot!
Enlarged card sprites can be obtained from here
Screenshots (Official / NostalRo)